Electrode securing means



Feb. 15, 1949.

W. L. KRAHL ELECTRODE SECURING MEANS Filed June 7, .1946

, INVENTOR. 196212 51 L ffra/ZZ 1M M JMZLHP "TOR/V5) Patented Feb. 15, 1949 uurrlzo STA'TES of Massachusetts Applicationtlune 7, 1946,'Serial o. 674,955

This invention, while relating broadly: to a structuralgfabrication of metallic and non-ma tallic -parts, has more particular reference to a meansfor securing metallic-parts of electronic devices to insulating supports in accurate relationship to one another. g V

Specifically, the invention. relates to the assembly of a cathode ray tube gun andto a new andnovel means whereby electrodes, bothcylindrical and disc-like, and deflection plates, are rigidly: clampedipreciselyl inpr edetermined rela-- tive arrangement to a' plurality of supporting columns or posts, such as tubularceramic rods regularly spaced in a circle concentric with the axis of the gun. v

In electronic devices of this character different clamping methods have been used'which have not been entirely satisfactory in that true parallel spacing and axial alignment of the electrodes are difiicult to obtain. One such method now in commen use is to employ eyelets as the securing means, these eyelets being pressed into the electrodes, as sleeves to slidably receive the supporting columns, and later crimped into binding engagement with suchsupports by means of a speciaI tooldesignedforthat purpose.

, ressure of the tool in thecrimping operation; and the depth of the grooves "formed in the'sleeves cannot be too greatly variedowing to' the brittleness of the ceramic rods and theirpossibility of being'broken. Yet, there'must of necessitybe a tight fit of the sleeves on the rods due to having to center the electrodesover a plurality of 'supports. and to the necessity to hold the electrodes rigidly; Because of variations in ceramics the binding action of eyelets to these ceramics is not uniform and in somefinstances it is so tight as to break the ceramicswhile in othersthe clamping is not secure. Furthermore; torsional strains that may be exerted by application of a crimping-tool have a tendency to throwthe parts out of alignment.

Oneof the principal objects of the present invention. therefore, is to eliminate the use of eyelets and substitute securing means which will assure a uniform and rigid clampingof all metalto-ceramic connections.

Another object of the invention is to provide an'improved and more rigid cathoderay'tube gun in which the electrodes are accurately spaced and aligned in their relationship one with an other, and in the assembly of which it is not re quired to use either axial or 'torsionalfforces, the onlypressure appliedin clamping the electrodes in place being in lines radially thereof.

ea n h mb r o be su pbrted. Thus sem cylindrical i giiijooyles; in these half portions Qf th clamps are accurately positioned with relation'to onev another and tolthe center of the member of which they are a part. These grooves are of such a radiusthat their side walls snugly fitthece: ramic" posts and provide accurately aligned locating means for the supports when the parts to be secured thereto are set up in an assembly fixture. .j And aiurtheriobjectdfthe'invention isto per? m1 sl i lra e g tro c evic o th'e; ha riactertdescribed witht greater ease, m0r;e expedi; tiousl'y' and with simpler tools than required" with er in met ds h re io us d To these and other ends the. invention consists, of certain parts, and combinations of partsvasf will be gully set fortnm the following 'descrip; tion and particularly defined in the appended" claims,

The accompanying drawings illustrating. the invention as einbodiedin the gun, of a cathode ray. tube and forming a part of the specification areas follows side elevation of the gun, 'part 'of' the end rrair of deflection plates bein broken away in Fig. 1 to moreclearlybringoutythe invention.

Fig. 3 is a sectional viewonl inje 3'3 of Fig; 2'. Fig. ,4 is an enlargedsection'al' detail on line" 4'-4" rF1g, 3. g p Y Fig; 5 is a view from the underside of Fig. 4', but showingfthe' clampingmea'n in full.

Fig. 6 shows a'cathode' ray tube in side eleva tion, a portion of the envelope b'eing' 'broken awaytoshow a part of tliegun mountedtherein.

. ig. T7 is an enlarged fragmen tary section taken In the drawings similar reference'num'erals PATENT *omce Fig. .1 is an end" View and. i 2' isla iew in I and within the reduced, straight end of which the gun, indicated as a whole at 2, is arranged and mounted in the usual manner, as by lead-in wires sealed into a glass header not shown, the base beingindicated at 3 and terminal pins at 4.

The gun, in this instance, is shown as including a plurality of axially spaced disc-like electrodes, 5, 6, and I which are substantially similar in that they are of like diameter and have flat portions of comparatively large area in which a series of holes 8 is arranged in a concentric circle. The disc 6 is shown as having a centrally disposed depending cylindrical projection 9 while pressed upwardly from the plane of disc I is a shorter cylindrical part I9.

Coaxial with the discs 5, 6, and I but spaced below them, that is with respect to Figs. 2 and 6, and likewise axially spaced from each other, are a plurality, in this instance two, cylindrical electrodes II and I2 to the outer face of which collars I3 are welded, these collars being at right angles to the cylinders and formed as are the'discs of comparatively thin sheet stock but of a diameter less than that of the discs 5, 6, and I. These cylindrical electrodes, according to their lengths, may be provided with one or more of the collars I3, as shown.

Between the disc electrodes 5 and 5 there is a pair of vertically arranged deflection plates I4 spaced equidistant from the axial center of the discs and above the disc 5 is a similar pair of plates I5, but disposed at right angles to the plate I4.

The disc 5, referring to Fig. 1, has a relatively large central opening I9 while the disc I has a relatively small aperture in its center which must be in accurate axial alignment with similarapertures in discs secured within the cylindrical parts 9, II, and I2. One of these apertures which are provided for the passage of the electron beam is shown at I8 in the disc H in Fig. 3. These discs must be held in true parallelism and in definite spaced relationship with respect to adjacent discs.

The metallic parts above enumerated are insulatingly supported in this instance by four parallel columns I9 regularly spaced angularly in a circle concentric with the axial center of the gun. These columns are, preferably, cylindrical and comprise tubular ceramic rods, the means employed for securing the metal parts to the ceramics constituting the present invention.

The die-formed discs 5, 6, and I are fiat and in the area within the circle of holes 8 substantially rectangular sections 29, as shown for one of the discs in Figs. 7 and 8, are cut in the blanking operation along three sides and in the forming are bent outwardly at right angles along their inner longitudinal edges, these sections, also being drawn to the contour shown, that is,'to provide for each a semi-circular groove portion centrally disposed and terminating in side flanges 2| the outer faces of which lie in a plane coincident with the center of the groove. Openings 22, are thus provided in the discs 5, 6, and I which receive the rods I9 and the inner faces of the grooved portions are of a radius to snugly flt the rods.

Thus, there are formed the inner members of the disc-to-ceramic securing means, the outer complementary members or anchoring means 23 being formed from strips of a width equal to the depth of the sections 29 and having outwardly pressed grooved portions terminating in flanges 24 opposed to corresponding flanges 2| and which by fastening means, as spot welding, are attached to the flanges 2I. The radius of the grooved portions of the anchor'strips is the same as that for the grooved portions of the sections 20, that is to flt the ceramics snugly, but the. included angle is slightly less than so that when the flanged ends 2| and 24 are welded the grooved portions of the sections 20 and the anchor strips 23, forming. split collars practically encircling the rods I9, will be drawn into secure binding engagement with the rods.

In blanking out the collars I3 they are provided with radially projecting rectangular portions which in the forming operation are bent at right angles along lines tangential to the peripheral edge ofthe collarsto form the inner members 25 of clamping means for the cylindrical electrodes II and I2, these members, like the section members 20, having semi-circular grooved portions to fit the rods I9 and which terminate in flanges 25. Complementary to the members 25, as the clamping parts for encircling the outer portions of the rods I9, are anchor strips 23 the flanges 24 of which are welded to the flanges 26 in the same manner as the corresponding parts of. the like anchor strips for the disc electrodes are attached to the flanges 2| of the section members 29.

For supporting the pairs of deflection plates I l and I5 and securing them to the ceramic columns, brackets are welded to the outer faces of the vertical portions of these plates and include outwardly extending arms 21 which, adjacent their outer ends, are formed with semi-circular grooved portions to also snugly fit the rods I9. Likewise, anchor strips such as indicated at 23a, form the complementary parts of these clamps and have their flanges 24a welded to the opposing extensions or flange portions 28 of the arms 21.

In assembling the gun, a suitable fixture is provided for holding the disc electrodes 5, G, and l, the cylindrical electrodes II and I2 and the pairs ofdeflection plates I4 and I5 in proper relationship. Four ceramic rods I9 are then placed in position, and itwill be observed that with the centers of the grooved portions of the parts 29, 25, and 2'5 of corresponding clamps in axial alignment, these portions will function as locating means for the rods. One of the anchors 23 is then placed opposite each of the sections 20 and members 25 and an anchor bracket 23a against the grooved outer end portion of each arm 21, so that respective grooved portions are in contact with the ceramics, and the flanges of anchors are-welded to the corresponding opposite flanges on the members to which the anchors are to be attached. Thus, since the diameters of the complementary clamping members, comprising the split collars for securing the discs, the cylinders supporting collars and the deflection plates, were selected to fit the ceramics tightly, and since the anchors 23 and anchor brackets 23a must be bent slightly to be Welded in place, it will be obvious that the ceramics will be uniformly gripped and securely held. .It will also be obvious that the ceramics will be forced toward the center of the discs and collars as far as the respective grooved portions of the parts 20 permit. Therefore the disc electrodes and cylindrical electrodes will be concentrically secured if these parts, with the de- Zflectiomplates, ,are accurately, aligned. and little -cer amic lsupportseare straight. ,And, it will also -be-lnotedsthat this. method -of I securing discs ,and cylinders: to ceramicshas-no tendency to change -;-the ,spacing between the :fiat, sections of these {collars-and discs, asisithe'case,withgtheuse of i bersato each other in accurate predetermined ret-lation one of said members being of sheet materiaLan-d including aflat portion and: the other alsupporting post, saidsecuring means compris- Ling; complementary clamping members formed ewithopposing-channels the walls of which are in gripping engagementwithsaid post, one of said clamping members being integral with the flat portionkof.said;sheet,,member, with its channel extending angularly from said flat portion and providing a locati'n means forsaid post, and said other clamping member being attachable to said first named member on opposite sides ,of said post and providing an anchoring means for the post.

2. Means for rigidly securing a disc-like member of; sheet material to.a supporting post in predetermined ,angular relation} to each other,.said

,- s ecuring means comprising complementary 'clamping members formed. with opposing channels' the walls of which are in grippin engagement with said post, one of said clamping members being a sectional portion bent outwardly from the body of said disc-like member-parallel to said post, with its channel providing a locating means for the post, and said other clamping member being attachable to said first named member on opposite sides of said post and providing anchoring means for the post.

3. Means for rigidly securing a disc-like member of sheet material to a supporting post in predetermined angular relation to each other and at the peripheral edge of said disc-like member, said securin means comprising complementary clamping members formed with opposing chann'els the walls of which are in gripping engagement with said post, the inner one of said clamping members being a radially projecting portion bent from the plane of said disc-like member parallel to said post, with its channel providing a locating means for the post, and said other clamping member being attachable to said first named member on opposite sides of said post and providing anchorin means for the post.

4. Means for securing a disc-like member of sheet material to a plurality of supporting posts parallel to each other and at right angles to said disc-like member, said posts being cylindrical with their axes located on radii from a common center and regularly spaced on a circle concentric with said center, said securing means comprising, for each post, a sectional portion pressed from the plane of said disc-like member and formed intermediate its ends with an inwardly pressed semi-circular groove of a radius to snugly fit one of said posts and with its center line coaxial with such post, a flange on said sectional portion each side of said groove, an anchor strip having a groove opposing that of said seci= i s rin l Means forsr-igidly securing-two framemem- 5.1% res ie i s ei es acterized by the dius-oithe grqovesinsaid chor strips, being the same as that, of the grooves in said sectional portions j, and by the included .arc,of--.the groo, ,e in each of ssaid strips being en s a-Qata 1 l h'il l s than 1 t6- ?Meee rie ri id y s r n is rl el i le ,die formed sheet metal discs stoa plurality i of it 'n @93 s pseri o a 9t 9?! tin material, with said. discs precisely spacedaxially 15 of each, other in true parallelism and wit'h said .seeeo isetris ten le i s tdisq e id ularl s eee i a rd nc n r th rewi h id eem ae c m r cl m si s egseesea s n arms-i te se 4? ends with inwardly pressed semi-circular. gr

i ,f rediu iweuel lfi deupp 'rf said-sueports extendingfihrough openingsin said d ti ,b pres in sa ciiee Db angles [on said sectional portions .in planes d.- cide nt with the d iamet ersof said.supports, ganchorstrips formed with greeves'ppp singi the grooves in said sectional portions, Tand iflangeS Jpn said. strips, the inner races of which are welded ltl ejouter faces of the corresponding flanges on said sectionalportions, the included are; of the "groovesfin said a choring strips being slightly r se tha 0 5 7, h ,an, electronic ,device, a disc electrode a cylindrical, .ctrode, having a surrounding collar ii e'i n wi l brtion arena" topfg plurality of ceramic posts regularly spaced in a circle concentric with said cylindrical electrode for insulatingly supporting said electrodes concentrically and in predetermined axially spaced relation to each other, said disc and said collars having projecting portions bent normal to the planes of said disc-like portions, said projecting portions being formed intermediate their ends with inwardly pressed grooves forming arcs of a circle of radius permitting the walls of said grooves to snugly fit said ceramic posts, aligned grooved portions of said two electrodes being locating means for said posts, flanges on said projecting portions at opposite sides of said grooves, and means cooperating with said projecting portions for rigidly clamping said disc and said collar, respectively, to said posts comprising anchor strips having grooves to receive the outer porto opposing flanges on said projection, the included arc in at least one of each of the pairs of grooved members being less than 180.

8. A cathode ray tube gun assembly including a disc electrode and a pair of deflection plates spaced apart equidistant from the axial center of said disc, a plurality of ceramic posts at right angles to said disc and regularly spaced in a circle concentric therewith, said posts being the means for supporting said disc and said plates in axially spaced relation and extending through openings provided in said disc, and means for rigidly clamping said disc and said plates to saidv posts comprising split collars encircling said posts flanges extending laterally from the encircling together and with the included are of at least onal ,portions .bent along one edge .from the tions of said posts and including flanges Welded and formed of complementary sections including:

one section of each collar being slightly less than.

:ing collar of less diameter than said disc electrode, :a pair of deflection plates, a plurality of ceramic :rods for supporting the said parts with said electrodes in axial alignment and with said disc, col lar and deflector plates in predetermined spaced relation to each other, said disc and collar being parallel and said rods arranged at right angles thereto and regularly spaced in a circle concentric therewith, and means for rigidly securing said electrodes and said plates to said rods comprisin arms extending laterally from the outer side faces of said plates, rectangular sectional portions bent along one edge from and at right angles to said disc and providing openings for said rods, like portions forming radial projections on said collar and bent at right angles on lines tangential to its peripheral edge, semicircular grooves pressed from the plane of said arms and inwardly from said disc sections and said collar projections, flanges along the side edges of allof said grooves, said grooves being of a radius to snugly fit said rods and providing locating means for the rods, respective ones of said grooved parts having their grooves in axial alignment, and anchoring means for said rods'comprising metal strips grooved to form clamping members complementary'to said grooved arms, rectangular sections and collar projections and including side flanges which by welding are attached to respective opposing ones of said first named flanges, the included are of the grooves in said anchor strips being slightly less than 180.

10. In an electron discharge device, an electrode comprising a generally flat part of sheet metal, an insulator, and means to secure said electrode and said insulator together comprising a channel extending transversely from said flat part and a strap secured to said channel, said insulator being gripped between said channel and said strap,

11. A cathode ray tube having an electrode comprising a generally flat sheet metal support and a transversely extending active portion, an

insulating post transverse to said support, and

means "to secure said post and said electrode together comprising a channel extending transversjely from said support and a strap secured to said channel, said insulator being gripped between said "channel and said strap,

WALTER L. KRAHL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENT Number Name Date 2,060,825 Ressler et al. Nov. 17, 1936 2,202,607 Steudel May 28, 1940 2,372,901 Koch et al Apr. 3, 1945 2,393,057 OLarte et a1 Jan. 15, 1946 

